WIRING GUIDELINES BASED ON
VARIOUS COMPONENTS
Check the store legend for components requiring
electrical circuits to either the compressor unit or
the defrost control panel. These include:
– Defrost termination thermostat
– Thermostat controlling a header mounted
liquid line solenoid
– CDA temperature control
– ETR temperature control
– Satellite control
All thermostat and temperature sensor wires should
be sized for pilot duty at 120VA 120VAC. Run a 2-
wire circuit for each system using any of the five
controls listed above.
Unit Cooler Fan Wiring
Provide a 120/1/60 fused power supply for each
cooler. (Check the store legend to see if 208-
230/1/60 is required at this location.)
Evaporator Mounted Liquid Line Solenoid
Power for a liquid line solenoid in the case can be
picked up from the fan circuit. (Check fan motor
and solenoid voltages first.)
Select Wire Size
Based on the serial plate ampacity of the system,
select the largest connectable wire size from Table
1.
Cooler Door Switch Wiring
Check the store legend for door switch kits (M115
or M116). The switch must be mounted to the
cooler door frame, and must be wired to control
the field installed liquid line solenoid and the fan
circuit. For Koolgas applications, kit M116
includes a check valve to bypass the liquid line
solenoid valve.
Sizing Wire and Overcurrent Protectors
Check the serial plate for Minimum Circuit
Ampacity (MCA) and Maximum Overcurrent
Protective Devices (MOPD). Follow NEC guide-
lines.
Defrost Controls
These circuits may be repeated and/or intermixed
in one store.
Other Controls
When other controls are used, refer to the manual
included with that control.
ELECTRICAL
September 1, 1997
4 - 2
HUSSM ANN CORPORATION • BRIDGETON, M O 63044-2483 • Printed in USA
Table 4-1 — Required Field Wire Size
*Include control circuit amps if single point connection transformer option is used
12A for 208V systems
6A for 460V systems
(Refer to NEC for temperature derating factors.)
TOTAL CONNECTED MCA* LARGEST CONNECTABLE WIRE
(Based on no more than 3 wires in the 75
O
C Wire Rating 50
O
C
raceway and 30
O
C environment per NEC.)
140A (max)
00 per Phase
248A (max)
350 mcm per Phase
408A (max)
2
x
(250 mcm) per Phase
608A (max)
2
x
(500 mcm) per Phase
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